Cessna 172P - Ammeter 7

switch,
labeled
BAT,
controls
all
electrical power
to the
airplane.
The left
half,
labeled
ALT,
controls
the
alternator.
Normally,
both
sides of
the
master
switch
should
be used
simultane-
AVIONICS
POWER
SWITCH
SECTION 7
AIR,PLANE
& SYSTEMS DESCR,IPTIONS
CESSNA
MODEL
172P
Electrical
power
from
the airplane
primary
bus to
the
avionics
bus
(see
figure
7-7)
is controlled
by
a
toggte
switch/circuit
breaker
labeled
AVroNIcs
PowEn
.
The switch
is located'on
the left
side
of
the switch and
confrol
panel
and
is
ON in t
position.
With
the
switch
in
the off
posit
ãpplied
to
the
avionics
equipmont,
regar
r ãwitch
or the
individual
equipment
swit
also
functions
as
a
circuit
breaker.
If an
electrical
malfunction
should
occur
and cause
the
be
If
es
should
u"
prr""o
iui
or
off,
starting
the
be utilized
in
place
AMMETER
'rhe
ammeter,
located
on the lower
left
side
of the
instrument panel.
indicates
the
amount
of
current,
in amperes,
from the
alternator to
the
battery
or from
the
battery
to the airplane
electrical
system.
when
the
engine
is
operating
and
the rhaster
switch
is
turned
on, the
ammeter
indicates
the
charging
rate
applied
to
the
battery.
In
the event the
¿rltelnator
is
not functioning
or the electrical
load
exceeds the
output
of
the
alternator,
the
ammeter
indicates the
battery
discharge
rate.
ALTERNATOR
CONTROL
UNIT AND
LOW-VOLTAGE
WARNING
LIGHT
The
airplane
is
equipped
with
a combination
alternator
regulator
7-26
30
May 1980